Composition of matter to be used in making waterproof and polishable cements.



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COATING OR PLASTIC.

UNITED STATES PAUL O. KROTTNAURER,

PATENT OFFICE.

OF CHICAGO, ILLINOIS.

COMPOSITION OF MATTER TO BE USED IN MAKING WATERPROOF AND POLISHABLECEMENTS.

Specification of Letters Patent.

Patented July 31, 1906.

Application filed August 14. 1905. Serial No. 274,243.

To all whom it may concern:

Be it known that I, PAUL O. KROTTNAU- RER, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Comositions of Matter to be Used in Making Vaterproof and PolishableCements, of which the following is a specification.

It is an established fact that concrete or artificial stone made ofPortland cement and other aggregates lacks density, is more or lessorous, absorbing moisture, and takes polis only where the aggregatesappear on the surface. The cement itself does not polish.

To avoid the porosity of the concrete or artificial stone and to makethe Portland ccment impermeable and take polish is the object of myinvention.

Having for my object the use of the silica in a gelatinous form mixedwith a fatty acid water, I must saponifv the natural fat which I use forfire manufacture of a waterproof ifiaterlaIoi compound. I

y racid or oxyacid be added to Portland cement, a reaction takes placeaccompanied by the production of heat, forming a gelatinous precipitateof silicic acid at once, and at the same time as the calcium oxid isneutralized by the acid a salt of the metallic oxid of calcium and acidis formed by the interchange of the elements of the acid and calciumoxid, hydrogen of the first being replaced by metal of the second, whilethe rest of the hydrogen and oxygen give rise to another part of thereactionnamely, the formation of water. Instead of saponifying the fatseparately from the decomposition of the Portland cement by acid I notonly make use of the heat generated by the latter process, but of theheat and water produced in the nascent state, both of sufficiently hightemperature to decompose neutral fats into fatty acids (soap) either byWater and heat alone or by the surplus of saponifying agents present inthis process of treating cement with acid. Concentrated acid cannotalone be used for dissolving Portland cement because of a too suddenreaction taking place, resulting in a caked or grainy product.

In the manufacture of my waterproof com-- pound it is of the utmostimportance to avoid a surplus of water, and finding the amount of waterproduced by the reaction of the acid bein suflicient to saponif the fatused instea of diluting the acid heat and mix fat and cement beforeputting in the acid. This retards the reaction when cement is treated 60O SI ITodone hundred pounds 0 Portland cego ment a d six pounds ofnatural fat w 0 1 thoroughly by hemuggi then treat this mixture with109.45 pounds of acid. This results in forming a soapy gelatig nou"s'substance which is practically soluble 7 5 in waiter.f fiTo1 this isadded lone hundred oun s o ne y-ground dr c a or earth matter, likechalk or colrifiiifia't'er. Thiz forms my cmid, w c 1 may e a ded to 1Portland cement in the proportion of one pound to ten pounds of Portlandcement which when gaged with wa er W1 se s yet will harden more promptlythan the ordinary commercial Portland-cement mortar, and if mixed withthe usual amount of aggregates an artificial stone can be made havinggreater density and hardness, taking a polish like marble, and be imermeable to moisture. This compound mixe with Portland cement (thelatter very finely ground) and water to a consistency of paint and aplied with a brush to metal or stone; artificia or natural,hardens welland makes an excellent protection to exposed surfaces.

Portland cement alone is not satisfactory as a paint, as it dries outbefore hardening and eels off. For cement used in making semig mortarfor artificial stone I dry the puttyike compound and grind it into thecement in the ordinary way.

Having thus described my process, what I claim, and desire to secure byLetters Patent, is

l. The herein-described composition of For matter consisting of Portlandcement sixteen clay or coloring matter, substantially as to parts,natural fat one part, acid eighteen and specified.

twenty-four one-hundredth parts, and finely- In testimony whereof Iafiix my signature ground claiy or colorin -matter sixteen parts, inpresence of two Witnesses.

5 substantia yas speci ed.

2. The herein-described com osition of PAUL KROTTNAURER' matter producedby first mixing ortland ce- Witnesses: ment with fiat, then treatingthis mixture H. C. HUNSBERGER,

with acid and adding thereto finely-ground W. H. FAIN.

